 The region belonged to Himmersyssel during the Middle Ages, with the exception of Kær Herred - located north of the Limfjord - which belonged to Vendsyssel.In 1542, the north Jutland region was reorganised as Aalborghus Len.This province was divided in 1662 forming Aalborghus County and Aastrup, Sejlstrup and Børglum County.